Cycles of Soil

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PHOSPHORUS IN THE ENVIRONMENT: Natural Flows and Human Interferences (2000, background): “05% of total P in the top 50 cm of soil (31) yields about 50 gigatonnes (Gt) P, or roughly 3.”
Pathways of nitrogen utilization by soil microorganisms - a review. (2010, background): “While a C to N ratio greater than about 40 results in net N immobilization, a C to N ratio below 20 normally leads to net N mineralization (Stevenson, 1986; Whitmore, 1996; Cabrera et al., 2005).”
Regulation of extracellular protease activity in soil in response to different sources and concentrations of nitrogen and carbon. (2008, background): “These three C to N ratios were chosen because residues that have C to N ratio greater than about 30 result in net N immobilization, while residues with a C to N ratio below 20 normally lead to net N mineralization (Stevenson, 1986).”
Micronutrients for Sustainable Food, Feed, Fibre and Bioenergy Production (2008, background): “Mafi c volcanic rocks (rich in ferro-magnesium minerals- also known as basic rock), for example, typically contain higher levels of micronutrient metals than felsic (rich in feldspar and silica) volcanic rocks (Stevenson and Cole, 1999).”